Adjustable chair



FIG. 1 is a perspective view of an adjustable chair, showing my new design;

FIG. 2 is a side elevation of the adjustable chair in the upright position;

FIG. 3 is a side elevation of the adjustable chair in the horizontal position;

FIG. 4 is a fron elevation of the adjustable chair in the upright position; and,

FIG. 5 is a rear elevation of the adjustable chair in the upright position. 

The ornamental design for an adjustable chair, as shown and described. 